Instructions

In the following number series only one number is wrong. Find out the wrong number.

Question 128

5, 55, 495, 3465, 17325, 34650, 51975,

Solution

Consecutive odd numbers starting from 11 in decreasing order are multiplied.

5 $$\times 11$$ = 55

55 $$\times 9$$ = 495

495 $$\times 7$$ = 3465

3465 $$\times 5$$ = 17325

17325 $$\times 3$$ = 51975

51975 $$\times 1$$ = 51975

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